Add changelog

CHANGELOG.md

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+# Changelog
+
+## 0.1.0 - 🎉 first release
+
+This is very first release of Langsfer.
+
+It contains:
+
+- Embedding initialization methods:
+
+  - [WECHSEL: Effective initialization of subword embeddings for cross-lingual transfer of monolingual language models.](https://arxiv.org/abs/2112.06598)
+  - [CLP-Transfer: Efficient language model training through cross-lingual and progressive transfer learning.](https://arxiv.org/abs/2301.09626)
+  - [FOCUS: Effective Embedding Initialization for Specializing Pretrained Multilingual Models on a Single Language.](https://arxiv.org/abs/2305.14481)
+
+- Tutorial notebooks showing how to use the 3 implemented methods